Surface Treatment Method for a Steel Workpiece Using High Speed Shot Peening

Author:  Y Yamada; M Ishida; K Uzumaki
Source:  US Patent 5,816,088
Doc ID:  1998026
Year of Publication:  1998
Abstract:  
Fatigue-resistance is significantly increased by performing shot peening using fine shots. A plurality of particles of hard metal having a diameter ranging from 20 to 100 micrometers are ejected onto a surface of a steel workpiece at an impinging speed greater than 80 m/second. The impinging speed is controlled so that the upper limit of temperature rising of the surface of the workpiece is maintained at a temperature more than 150 C. but less than the temperature at which recovery recrystallization and austentizing of steel occurs.